Centrifugal pump.



e. H. ANDERSON.

CENTRIFUGAL PUMP.

APPLICATION FILED N0V.29l i915.

Patented Sept. 4, 1917.

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G. H. ANDERSON. CENTRIFUGAL PUMP.

APPLICATION FILED NOV-29.1915.

WITNESSES: `l

Patented sep-t. 4,1917.

5 SHEETS-SHEET 2.

ATTORNEYS.

G. H. ANDERSON.

CENTRIFUGAL PUMP.

APPLICATWN FILED NOV-29, 1915. 1t 93;?3 i Patented Sept. 4, 1917.

5 SHEETS-SHEET 3.

WITNESSES.- INVENTOR.

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G. H. ANDERSON.

CENTRIFUGAL PUMP.

APPLICATION man Nov.29. 1915.

Patented. @apt 4, 1917.

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GEORGE H. ANDERSON, OF BATTLE GREEK, ,IVIICHIGAINZ `GEIVTRIFUG'AII PUMP.

Specification of Letters Patent.

Patented Sept.. 4I, :wil 't'.

Applieaton led November 29, 1915. Serial No. 64,146.

To all 'whom t may concern.'

Be it known that I, GEORGE I-I. ANDERSON, a citizen of the UnitedStates, residing at Battle Creek, county of Calhoun, State of Michigan,have invented certain new and useful Improvements in Centrifu al Pumps,of which the following is a speci cation.

This invention relates to improvements in centrifugal pumps.

The objects of my invention are:

First, to provide improved means of automatically balancing andcentering the impellers of such pumpsto equalize the pressure thereonand avoid end thrust in the impeller shaft. i

Second, to provide improved means of insuring lubrication ofsaid'impeller in conjunction with the said balancing means.

Third, to provide an improved detail sectional construction whereby thepassages for the -water are made accessible so they may be machined andmade smoot Further objects, and objects relating to details andeconomies of construction and operation will definitely appear from thedetailed description to follow.

I accomplish the objects ofmy invention by the mechanism and meansdescribed in the following specification. rIhe invention is clearlydefined and pointed out in the claims.

Structures which are preferred embodiments of my invention are fullyillustrated in the accompanying drawings, forming a part of thisspecication, in which:

Figure I is a longitudinal sectional view through a multi le stagecentrifugal pump embodying the eatures of my invention in one of thepreferred forms, the same being taken on the irregular section linel-lor Fi II.

ig. II is a transverse detail sectional view taken on a linecorresponding to line 2-2 of Fig. I, showing the relation of theimpellers and diusion varies. 4 Fig. III is a detail structure of thecasing plates 4 5, and 6 of Fig. I showing their relations to eachother` and how the ports may be machined and the disks fitted to ether.

ig. IV is a detail transverse sectional view somewhat reduced, taken ona line corresponding to line 4 4 of Fig. I, showing the intake chamberfor the pump and an intake ort thereto. Y

Fig. I7 is an enlarged detail sectional view taken on a linecorresponding to the line 5-5 of Fig. II, showing the packing betweenthe casing plates of the structure of Figs. I and II.

Fig. VI is a longitudinal detail sectional view through a modified formof my improved pump, of a usual form of single stage American design,taken on a` line corresponding to the irregular line 6-6 of Fig. VII.

Fig. VII is a detail sectional view taken on a line corresponding toline 7--7 4of Fig. VI.

.Fig VIII is an enlarged detail sectional vlew taken on a linecorresponding to line 8-'8 of Fig. IX, showing the adjusting means foradjusting the saw tooth equalizing and resistance bearing means.

Fig. IX is a detail transverse sectional view of the same means, takenon a line corresponding to line 9-9 of Figs. VI and VIII.

Fig. X is a detail longitudinal sectional view through a multiple stagepump of the American design, similar in detail to the single stage pumpillustrated in Fig. VI.

In the drawing similar numerals of reference refer to similar partsthroughout the several views and the section lines are taken looking inthe direction of the little arrows at the ends of the section lines.

Considering the numbered parts of the drawing, the driving shaft 1 hasthe impellers 2, of any usual or desired form for a centrifugal pump,secured thereto and definitely located by suitable shoulders 2 on saidshaft. 3 are the diffusion vanes of suitable form supported `by suitablemeans between the casing plates or rings 4f, 5, 6, 5, 6', 7 and 8, theplates 4 and 8 being the front and rear respectively. m',

A relief pipe 9 connects to the plate 19 to relieve anyundue pressure onthe side of the outside impeller. 10 is a stuiing box for the shaft atthe discharge side of the pump. l1 is the intake chamber. 12 is thewater connection to. the stung box 13 to insure eEective water packn andlubrication at that point. 14 1s the Iiracket carrying the journalbearing. 15 is the packing between the casin plates consisting of .aring of rubber a apted to completely fill the t1"- angular spaces formedbetween these plates at their shoulders and supplementing the steamtight fit, of the metal-to metal itself. 16 is the discharge outlet. 17is the saw trated in Figs. I-to V that the entire struc-` ture may bemade up of standard units and the same can be completely machined withthe exception of the comparatively small apertures through the plates 5and 5 which can be readily filed outwith a special shaped lile, thusinsuring perfectly smooth parts for the passage of the water in thepump, thus greatly enhancing and insuring its eiiicienc It will be clearthat when the parts become worn so that they do not operate effectively,they can be taken apart and dressed down and brought into betterengagement, when the pump will again be as effectively operative as whennew.

It will be seen that when power is applied to the shaft 1 the suction onthe water and also the velocity and impact of the water will have atendency to shift the impellers first in one direction and then theother, and that the pressure of water created by their rotation willexert constant and 'varying forces, the tendency being to cause an unduethrust of the parts. The spaces surrounding the rotors become filledwith water, which, of course, 'is u'nder pressure and tends to work backthrough the joints at 17 and also the water will tendto work around thejoints 18 and 19 about the casing. When the pressure exerted on therotors moves them in one direction, the saw tooth bearing ring at thatside will tend to close and restrict the flow of Water 'therethrough,thereby increasing the pressure on that side and lowering the pressureon the opposite side, and the flow of water will naturally be to someextent increased on the opposite side, but this movement secures acounter effect on the operation of the annular groove 20 and thecorresponding engaging portion 20', and the supply of Water willautomatically be reduced on the side at which the ressure occurs, andincreased on the opposite side with a restriction of the space at thesavv tooth bearing part, and the tendency will be for the impeller toimmediately return past its initial position, but as soon as it assesbeyond the center the reverse condition occurs and the impellersimmediately oscillate in the opposite direction. The reaction of thewater on the bottom of the saw-toothed grooves is also greatest in themost restricted grooves, and as this reaction is parallel with the axis,1t also serves to keep the impellers in a balanced position.

The result is that it tends to oscillate through very narrow limits andis kept constantly centrally located and the thrust is resisted so thatthe impeller revolves with great freedom without end thrust, securingthe highest efficiency.

I have shown a preferred construction in Fig.' I, but the Americandesign of pump is somewhat different, the impeller and casing beingcored out and cast,-see Fig. VI where I have numbered the shaft 21, thecast impeller of peculiar design 22, the diffusion vanes 23, theperipheral casing 24, the discharge end plate 25 and the intake endcasing plate 26. I have here shown, because of the necessity ofadjusting the parts themselves, adjustable saw tooth packing rin 27 and28, the movable member of which is adjustable by bolt 29 in a stufiingbox through the casing plate 32 by set screws 30. VThe intake 31 issecured in place by bolts or otherwise. The stuing box 33 is similar tothe stuffing box 13, only somewhat more extensive because of the specialstructure. peller and the projectingportion 20 on the The annular groove20 on the imdiusion vanes are precisely the same as in saw tooth bearingis available with any form of impeller and diffusion vane, butespecially coacts with the shape I have shown. I might mention that thepump can be supported' on any suitable base or that suitable feet, asindicated in Fig. X, could be formed on the casing members themselves.

I have thus described my improved pump in all its details, I desire toclaim the same in the specific form and also to claim the same broadly,as pointed out in the appended claims. v

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is:

1. In a centrifugal pump, an impeller with suitable shaft for rotatingthe same, provided with concentric annular saw-tooth shaped projectingbearing portions and an- .ing portion corresponding with and coactingwith the V-shaped peripheral groove in the said nnpeller, the openmgs insaid 1mpeller and diffuser being ,of substantially.

the same width as specified.

In a centrifugal pump, an impeller with suitable shaft for rotating thesame, provided with concentric annular saw-tooth shaped projectingbearing portions, casing members' with annular saw-tooth packing memberscorresponding to the annular sawtooth bearing portions on said impellerand spaced therefrom, coacting for the purpose specified.

4'. In a centrifugal pump, an impeller with suitable shaft for rotatingthe same, provided with annular saw-tooth shaped projecting bearingportions, casingv members with annular saw-tooth packing memberscorresponding to the annular saw-tooth bearing portions on said impellerand adjustable toward and away from the projecting portions of saidimpeller, coacting for the purpose specified.

5. A multiple stagecentrifugal pump comprising a driving shaft, a seriesof impellers thereon with concentric annular saw-tooth bearing portionson their faces and hubs and with peripheral V-shaped grooves, separablecasing plates with annular saw-tooth members for coacting with thecorresponding bearing portions on saidvimpelleis and their hubs andspaced therefrom, fitting one against the other with suitable packingmeans therebetween, and diffusion vanes with inwardly projectingportions to engage and cooperate with the annular grooves i11 saidimpellers, coacting as described.

(5. A multiple stage centrifugal pump comprising a driving shaft, aseries of impellers thereon with concentric saw-tooth bearing portionson their faces and hubs, separable casing plates with annular saw-toothbearing members for engaging the corresponding bearing portions on saidimpellers and their hubs and spaced therefrom, fitting one against theother with suitable packing means therebetween, and diffusion vanes,coacting as described.

7. In a centrifugal pump, a shaft, an impeller provided with a hubmounted upon said shaft,the faces of said impeller and said hub beingprovided with concentric annular saw-toothed projecting bearingportions, annular casing members provided with annular saw-toothedmembers correspending to, coacting with the annular sawtoothed bearingportions of said impeller and hub and spaced therefrom, the inner edgesof said casing members being spaced from said hub.

In witness whereof, I have hereunto set my hand and seal in the presenceof two witnesses.

GEORGE H. ANDERSON. Witnesses:

TRESA A. LINK, MARTIN P. HUYGK.

